VOLVO
ECM-140C - Outside temperature sensor. Signal too high
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
8 modelsC70 (2006–2013), S40 (2004–2013), S60 (2001–2009), S80 (1999–2006), V50 (2004–2013), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (13)
- Volvo C70 (2006–2013)2006Engine B5254T3 only
- Volvo S40 (2004–2013)2005–2006Engine B5254T3 only
- Volvo S60 (2001–2009)2005–2006Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo S80 (1999–2006)2005–2006Engine B5204T5, B5244T4, B5254T2, B6294S2, B6294T only
- Volvo V50 (2004–2013)2005–2006Engine B5254T3 only
- Volvo V70 (2000–2008)2005Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo V70 (2000–2008)2006Engine B5204T5, B5244T5, B5254T2, B5254T4 only
- Volvo V70 XC / XC70 (2001–2007)2005All engines except: D5244T
- Volvo V70 XC / XC70 (2001–2007)2006Engine B5244T4, B5254T2 only
- Volvo XC90 (2003–)2005–2006Engine B5254T2, B6294T only
- Volvo XC90 (2003–)2007–2012Engine B5254T2 only
- Volvo XC90 (2003–)2013–2014Engine B5254T9 only
- Volvo XC90 (2003–)2015
What does this fault code mean?
The outside air temperature sensor signal goes through the central electronics module (CEM) to the engine control module (ECM). The fault is set when the sensor is shorted to ground, and also when the CEM judges the signal to be above its normal range.
Possible causes
- Contact resistance in the connections
- Signal wire shorted to ground
- Damaged outside air temperature sensor
What you can do
- 1First read the fault codes in the central electronics module (CEM) and fix them
- 2Check the outside air temperature sensor connectors for contact resistance and oxidation
- 3Check the wire to the outside air temperature sensor for a short to ground, chafing and pinch damage
- 4If you have a diagnostic tool: read the outside temperature in live data and check that it is reasonable compared with the surroundings
- 5If the wiring is fault-free and the fault remains: have a workshop measure the resistance of the outside air temperature sensor
Symptoms you may notice3
- Engine warning lamp comes on
- Hard starting, or the engine cranks slowly at start
- The outside temperature gauge shows wrong values or does not work
What the fault can affect1
- The intake air temperature sensor value is used instead of the outside air temperature
General guidance for car owners. Diagnosis on the car can point to a different cause.